Buggy code:
public class Sandbox { public static final String RUN_DIR = "run" ; public static final String CLASSES_DIR = "classes" ; private static boolean canRead ( File dir ) { } private static boolean canWrite ( File dir ) { } private static void iaxWrite ( File dir , String label ) { } private static void iaxRead ( File dir , String label ) { } private static void assertState ( boolean test , String message ) { } public final File testBaseDir ; public final File sandboxDir ; public final File workingDir ; public final File classesDir ; public final File runDir ; public final File stagingDir ; private final Validator validator ; private File testBaseSrcDir ; private File [ ] compileClasspath ; private String bootClasspath ; private File [ ] aspectpath ; private boolean gotClasspath ; private ICommand command ; private boolean gotCommand ; private transient String toStringLeader ; private transient boolean compilerRunInit ; public Sandbox ( File testBaseDir , Validator validator ) { } private String getToStringLeader ( ) { } public String toString ( ) { } public String toLongString ( ) { } void setCommand ( ICommand command , CompilerRun caller ) { } void clearCommand ( AjcTest caller ) { } void reportClassDiffs ( final IMessageHandler handler , IncCompilerRun caller , long classesDirStartTime , String [ ] expectedSources ) { } ICommand getCommand ( CompilerRun caller ) { } ICommand getCommand ( IncCompilerRun caller ) { } File getTestBaseSrcDir ( IncCompilerRun caller ) { } File [ ] findFiles ( final String [ ] names ) { } File getTestBaseSrcDir ( JavaRun caller ) { } void defaultTestBaseSrcDir ( JavaRun caller ) { } static boolean readableDir ( File dir ) { } void compilerRunInit ( CompilerRun caller , File testBaseSrcDir , File [ ] aspectPath , boolean aspectpathReadable , File [ ] classPath , boolean classpathReadable , String bootclassPath ) { } void javaRunInit ( JavaRun caller ) { } private void setTestBaseSrcDir ( File dir , CompilerRun caller ) { } private void setAspectpath ( File [ ] files , boolean readable , CompilerRun caller ) { } private void setBootclasspath ( String bootClasspath , CompilerRun caller ) { } private void setClasspath ( File [ ] files , boolean readable , CompilerRun caller ) { } File [ ] getClasspathDirectories ( boolean readable , JavaRun caller , boolean includeOutput ) { } File [ ] getClasspathJars ( boolean readable , JavaRun caller ) { LangUtil . throwIaxIfNull ( caller , "caller" ) ; Sandbox . assertState ( ( null != ( compileClasspath ) ) , "classpath<seq2seq4repair_space>not<seq2seq4repair_space>set" ) ; ArrayList result = new ArrayList ( ) ; File [ ] [ ] src = new File [ ] [ ] { compileClasspath , aspectpath } ; for ( int i = 0 ; i < ( src . length ) ; i ++ ) { File [ ] paths = src [ i ] ; int len = ( null == paths ) ? 0 : paths . length ; for ( int j = 0 ; j < len ; j ++ ) { File f = paths [ j ] ; <START_BUG> if ( ( FileUtil . hasZipSuffix ( f ) ) && ( ( ! readable ) || ( f . canRead ( ) ) ) ) { <END_BUG> result . add ( f ) ; } } } return ( ( File [ ] ) ( result . toArray ( new File [ 0 ] ) ) ) ; } String aspectpathToString ( CompilerRun caller ) { } String classpathToString ( CompilerRun caller ) { } String getBootclasspath ( CompilerRun caller ) { } String getBootclasspath ( JavaRun caller ) { } private static class NamesFilter implements FileFilter { private final String [ ] names ; private NamesFilter ( String [ ] names ) { } public boolean accept ( File file ) { } } }

Fix:
if ( ( FileUtil . isZipFile ( f ) ) && ( ( ! readable ) || ( f . canRead ( ) ) ) ) {